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研究了长白山红松遮荫苗、全光苗及大幼树一年生针叶越冬期间PSⅡ电子传递活性,叶绿素、类胡萝卜素含量、超氧物歧化酶活性及同工酶谱的变化,以阐明红松大幼树防止越冬光氧化伤害的部分内在机制。研究表明红松大幼树越冬期间PSⅡ电子传递活性的受抑制程度不亚于全光下的幼苗,但秋天积累的叶绿素较多,冬天超氧物歧化酶活性及类胡萝卜素含量均明显高于全光苗,为针叶提供了有效的保护。研究还表明,红松针叶在土壤冻结期间也具有合成这些物质的能力。未发现大幼树SOD同工酶谱和幼苗的质的区别。讨论了SOD在树木抗冻性中可能具有的作用。
The changes of PS Ⅱ electron transport activity, chlorophyll, carotenoid content, superoxide dismutase activity and isozymes during the winter overwinters of Pinus koraiensis seedlings, all-seedlings and young saplings of Changbai Mountains were studied to clarify the red Part of the internal mechanism of pine tree to prevent overwintering photooxidation damage. The results showed that the inhibition of PSⅡ electron transport activity was not less than that of the whole seedlings during the winter, but more chlorophyll was accumulated in autumn and the superoxide dismutase activity and carotenoid content were significantly higher in winter All seedlings, for conifer provides an effective protection. Studies have also shown that Korean pine needles also have the ability to synthesize these materials during soil freezing. No differences were found in SOD isozymes and seedlings of young saplings. The possible role of SOD in the frost resistance of trees was discussed.